Mounting for the stylus-bar of talking-machines.



PATENTED SEPT. 3,1907.

LL F. DOUGLASS. MOUNTING FOR THE STYLUS BAR OF TALKING MACHINES.

A PLICAfI N FILED MAR. a, 1906.

w m L UNITED STATES PATENT 'OFFIGE.

LEON F. DOUGLASS, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO VICTOR TALKING MACHINE COMPANY, A CORPORAIION OF NEW JERSEY.

\MOUNTING son 'rnn STYLUS-BAR F TALKING-MACHINES.

Specification of Letters Patent.

Patented Sept. 3, 1907.

Application filml' flw 8,1906. iiorial No. 304,910.

To all whom it may concern: I

Be it known that I, LEON F. DOUGLASS, a citizen of the United States, and a resident of the city of Philadelp'hia, State of Pennsylvania, have invented certain new and useful Improvements in Mountings for the Stylus-Bars of Talking-Machines, of which the following is a full, clean and complete disclosure.

One object of my invention is to produce a mounting for the stylus bar of a sound box of a talking machine, in

which the stylus bar may be more delicately, perfectly and efficiently mounted than heretofore, and the position and the tension of the stylus bar with respect to the diaphragm may be quickly and easily adjusted.

Other objects of my invention will appear below in tho specification and claims forming a part of this application.

Ilerctofore the sound boxes in which the stylus bar has been mounted upon a torsional device for giving a stylus bar is a disadvantage which reduces the efiiciency and quality of the reproductions by the sound box.

Briefly, my invention comprises an improved torsional mounting for a. stylus bar which may be easily adjusted by means of suitable holding or clamping devices located in both the stylus bar and the bearings for the torsional device.

For a full, clear and exact description of my invention reference may be had to the following specification and the'accompanying drawings forming a part thereof, in wliich Figure l. is a perspective View of a sound box having my improvedfstylus mounting secured thereto; Fig. 2 is a transverse sectional View thereof taken on the line 22, Fig. 3; Fig. 3 is a sectional .view of the mounting taken on the plane passing through the torsional spring or wire perpendicular to the plane of the diaphragm;

'Fig. 4 is a sectional view through one of the arms of my tube 4, in any suitable or well known manner; At-' tachcd toon'e portion of the periphery of the ring 1 is a U-shaped block 5, the arms 5 of which are provided with apertures 6 in alinement, through which passes the torsional pin, wire orspring 7, upon which the stylus bar is carried. Said pin, wire or spring smoothly fits Within said apertures 6 in said U-shaped block, and is secured within the same by set screws 8-8, the inner end of which jam or press against said torsional spring.

The stylus bar consists in two main parts, a portion 9 of which is adapted to receive the stylus needle, and the portion 10 of which is connected with the first main portion and also with the diaphragm2. 'lhe'portion .l is preferably made in the form of an L-shaped block, the one arm 11 of which is attached to the portion IOwhich connects with the diaphragm, and the othcr arm of which is provided with a socket 12 and set screw 13, by which the stylus is secured thereto. Passing through the said block is a transverse hole 14, within which the torsional spring or wire 7 smoothlyfils, and a set screw 15 carried by said block is adapted to engage said tor-- ,sional wire or spring 7 and clamp the stylus bar firmly to said spring. The inner faces of the arms 5 of the U- shapcd block are accurately squared with respect to the apertures 6 therein, and the L-shapcd block has its ends also squared to fit smoothly between the arms of said block.

A stylus bar mounted in the manner above described is very rigidly or firmly held between the arms of the supporting block, and the torsional spring or wire being at all times in contact with the holes in the block and stylus bar is so confined that it can move only torsionally, and any buckling or bending of the torsion spring is absolutely prevented. Moreover, the tension or pressure between thestylus bar and the diaphragm can be accurately adjusted since it is merely necessary to press the inner end of thestylusbar against the diaphragm with the required pressure, while either the set screw 15 or the set screws 8 are loose, and then hold or secure the stylus bar in such adjusted position by iscrcwing the set screws down against the torsional spring.

While I have described one embodiment of my invention I do not desire to be limited to the particular construction of sound box or of stylus bar above shown and described, since my invention contemplates the mounting of any stylus bar upon a torsional spring between shoulders which closely lit against the said stylus bar, whereby tin, pylus bar is prevented from mo ving in any direction except around said spring as an axis, the spring being so conli'lhed thatit can only .be flexed torsionally.

Having thus described my invention, what I claim and desire to protect by Letters Patent of the United States, is-. i i

1. In a sound box for talking machines, a stylus bar,'n support having-arms fitting against opposite sides of said stylus bar and said arms.

2. in a sound box for talking machines a stylus bar, a support illll i fil'; a torsional spring passing through said stylus bar and said supportv and nieans to prevent. the stylus bar from moving in any direction except about the torsional sprin as an axis I;. lit a sound box for talking machines the combination with a stylus bar of a support therefor, a torsional spring pa sing through said support and stylus bar. said support preventing said stylus bar from moving in any direction except about said spring as'an ni'cis.

-l. in a sound box for talking nacliinesthe combination with a stylus bar, a support having arms titting against opposite sides of said stylus bar, a torsional spring pa. in;; through said stylus bar and said arms and means to :idjustably liold said spring-in said arms and said stylus bar to said spring:

in a sound box a torsional spring, a stylus bar and a support, ngaginy. opposite sides of said stylus bar, said torsional spring: lll'l flg inc sod throughout its entire length by said stylus bar and id support.

t}. in a sound box the combination with a stylus bar of. a torsional spring p 'in; tlirougtrsaid stylus bar, and a fixed support for said spring, said support beingprovided with t": s which snugly fit against the, opposite sides of said stylus bar. a

T in a sound box a stylus bar, a mounting for said st lus bar comprising, a U-shaped block having its extremities engaging opposite sides of said stylus bar, and a toring; through said block and through said stylus bar and rigidly confined within each of said parts,

N. in a sound box a ylus bar. a support, a torsional spring comprising a pill rigidly connected to said stylus liar at its eentral portion and having its outer ends rigidly mounted in said support, the torsional portion olf aid spring being in contact -t'or its entire length \vithv said stylus bar and supportv 5'. in a sound box the combination with a stylus bar of bearings therefor; a spring p' inn; through said stylus bar and said bearings, means to secure said sprlnp; to said stylus bar and to said bearings. said stylus bur titling snugly between said beurinpsv lo, in a sound box for talkinp, niaeliines the combinaliar, means for holding said wire rigidly within said bearlugs and means for rigidly holding said stylus bar on said spring.

11. In a'sound boxior talking machines a stylus bar and a support therefor, said stylus bar and support being provided with ali'ned openings and a torsional spriiu, snugly fitting within said openings and means to secure said spring to said support andto said stylus bar.

1-2. in a sound hox for talking machines a stylus bar, a support engaging opposite sides of said s l'us liar, said stylus bar and support helm; provided with ali'ned circular openings, :1 round torsional spriin: inserted within said openings and snugly fitting the-sallle, means to rigidly secure the ends of said springwithin said support and means to secure said stylus bar to said spring midway he tween the ends thereof.

lit. In a sound box for talkingmachines, the comhination of a stylus bar with a recessed stylus bar support, the said recess and said stylus h'ar having llal. sides engaging each other, each of said sides being disposed in a plane parallel to the plane of oscillation of the stylus bar and a torsional spring passing, transversely through said sides, the said spring being in rigid engagement: with said bar and support,

l-l.. In a sound box for talking nmrhines} the conibina-.

Witnesses .\i.s'ro.\' ll. illoi'fluros, ALI-IXANUHI: lauic. 

